In this paper, we have proposed a new packet scheduling algorithm for short term fairness in this article. A feed-back control mechanism is proposed to improve the network packet scheduling algorithm. The weights of each client in the scheduler can be adjusted and controlled online according to the actual amount of service with the feedback mechanism. As a result, the robustness and the adaptability of network scheduling system have been enhanced. The capability of short term fairness has been improved, and each client can obtain a better fair QoS (quality of service) in network systems.